| 光谱学与光谱分析 |
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| Spectral Study of Three Compounds of Tungstosilicic Salt with Keggin Structure |
| CHEN Yi-ping1，ZHAO Shi-long1，ZHANG Han-hui1，2*，SUN Rui-qing1，YANG Qi-yu1 |
1. Department of Chemistry, Fuzhou University, Fuzhou 350002, China
2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou350002, China |
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Abstract Three compounds of tungstosilicic acid and tungstosilicic salt: K3H[SiWⅥ12O40]·3H2O(Ⅰ), (H3O)4[H3SiWⅥ9WⅤ3O40]·2H2O(Ⅱ) and [(CH3)4N]4[SiWⅥ12O40]·4.5H2O(Ⅲ), with Keggin structure, have been synthesized. The relationship between their properties and structures was studied by using FTIR, NIR FT-Raman, UV-Vis and flurescence etc. They possess isolated [SiW12O40] cage anion, which combines with cation and water by static electric action and weak hydrogen bond; The study of their FTIR and Raman spectra shows that the vibrational frequencies of the group are related to the structure of the materials. For the compoundⅡ, the vibrational frequency of νas(WOd) decreases as part of W6+ are reduced to W5+, and the charges of anion group affect νas(W—Oc—W)，νas(Si—Oa) and δ(Oa—Si—Oa) etc. apparently. In UV-Vis spectra of compound Ⅰ and Ⅱ, there are two characteristic peaks at 200 and 260 nm，respectively. The fluorescence spectra of compound Ⅰ were studied, and showed that the emission peak is at 350, 440，520 and 675 nm excited by 220, 350 and 440 nm.
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Received: 2002-08-26
Accepted: 2003-02-16
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Corresponding Authors:
ZHANG Han-hui
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| Cite this article: |
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CHEN Yi-ping,ZHAO Shi-long,ZHANG Han-hui, et al. Spectral Study of Three Compounds of Tungstosilicic Salt with Keggin Structure [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(03): 257-260.
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http://www.gpxygpfx.com/EN/Y2004/V24/I03/257 |
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